Whites GMT Manual Download Page 6 | Manualshive

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Whites GMT Manual Download Page 6

6

GMT Quick Start

Chapter 3 GMT Quick Start

GROUND BALACE Toggle
Two position switch for setting
either Fast AutoTrack or
Manual GROUND BALANCE

GAIN Control
For adjusting signal
strength coming from ground,
targets, and electrical interference

Audio THRESHOLD
Control that establishes
the sound level of the
background "hum"

Variable Self Adjusting Threshold
Speed Control (VSAT) for adjusting
the speed at which the THRESHOLD "hum" recovers
from the affects of changes in ground mineralization.

Audio Signal Boost Toggle
Switch-three position-On,
Off, and Battery Test

Iron I.D. Trigger Switch
three position-Forward,
Center, and Squeeze

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Summary of Contents for GMT

Page 1: ...ocks 11 Variable SAT Speed Control 11 VSAT Adjustment 11 Iron I D Trigger Adjustment 12 Threshold Control 13 Threshold Adjustment 13 Ground Balance Fast AutoTrac 14 Manual Ground Balance 15 Ground Balance Adjustment 15 Chapter 5 Searching 16 Pinpoint Technique 16 Headphones 17 Field Use Tuning Tips 18 Field Use Tuning Tips cont d 20 Field Use Tuning Tips cont d 22 Chapter 6 Information 24 Proper C...

Page 2: ...ETER DISPLAY 1 Iron I D Probability Bar Graph 2 Type of Minerallization 0 to 99 3 Amount of Mineralization 0 to 99 4 Battery Check Bar Graph or Message 5 Overload Message TOUCHPADS 1 Grab 2 Manual Gnd Balance AUDIO IRON I D TOGGLE CABLE RETAINERS BATTERY COMPARTMENT DOOR BATTERY COMPARTMENT LATCHES LOOP CONNECTOR HEADPHONE JACK CLEVIS LOWER ROD CENTER ROD SECTION ...

Page 3: ...e It is best to tune and practice out of doors to ensure stable predictable results Assembly Instructions 1 Remove all parts from shipping carton and check the assembly page to make sure all parts are present 2 Unlock S rod camlock and insert the reduced end of the center rod into curved S rod so that stainless steel spring clip buttons line up and lock into the holes in the curved S rod Turn caml...

Page 4: ...nd secure the two latches on the bottom of the case Hook the front of each latch first then press down on the rear CAUTION Battery Holder 802 7150 LIFT TAB AND PULL Standard Battery Holder 1 The standard battery holder holds eight AA cell batteries Alkalines are recommended for use with this model During normal searching condi tions you can expect about 40 or more hours of hunting time from one se...

Page 5: ...able batteries may be used until the display indicates dead battery or the audio loudness on large targets is diminished more than you like When traveling far from home it is always a good idea to carry 8 extra penlight alkaline batteries with you as well as an extra empty battery holder Rechargeable Battery Opt A rechargeable battery system is not standard equipment with your GMT however high qua...

Page 6: ...electrical interference Audio THRESHOLD Control that establishes the sound level of the background hum Variable Self Adjusting Threshold Speed Control VSAT for adjusting the speed at which the THRESHOLD hum recovers from the affects of changes in ground mineralization Audio Signal Boost Toggle Switch three position On Off and Battery Test Iron I D Trigger Switch three position Forward Center and S...

Page 7: ...weeps that overlap each other If you experience false signals or constant beeping or popping turn the GAIN down a bit You may notice a slight fluctuation in the THRESHOLD hum as the GMT tracks out the ground mineralization Also 1 2 3 4 5 6 7 8 9 10 if the meter and audio indicate Bad Ground turn the GAIN down till overload goes away SPECIAL NOTICE SPECIAL NOTICE SPECIAL NOTICE SPECIAL NOTICE SPECI...

Page 8: ...ion while searching you might go over a very large or very shallow target The message on the LCD display will read METAL TOO CLOSE LIFT SEARCHCOIL All such targets should be checked but the GMT will self correct after the message and you can continue to search as normal Gain Adjustment 1 The GAIN control knob turns the GMT ON and OFF and controls the GAIN Starting from the POWER OFF position and g...

Page 9: ...later section 6 While using a steady slow search coil sweep speed advance the control towards 10 while maintaining a quiet smooth background THRESH OLD hum If the BAD GROUND REDUCE GAIN alert keeps popping up on the display or if ground noises are still a problem reduce GAIN 7 The IRON ID capability of the GMT also functions more accurately when the GAIN is set at a level which allows for smooth o...

Page 10: ...per smaller targets to be found in dry washes and tailings in the desert The center position or Initial Setting position provides NO AUDIO SIGNAL BOOST The FOR WARD position provides a 4X boost in the loudness of the audio signal The PULLED or spring loaded position is used for BATTERY CHECK AUDIO SIGNAL BOOST is normally used on a temporary or as needed basis Since it will also boost the loudness...

Page 11: ...h threshold Remember overall depth will be diminished with a faster V SAT speed but if the ground is too noisy to separate a good target from a false signal it is better to operate with a little more V SAT speed than to lose a target altogether This is the same logic that was used in describing the GAIN control Lower ing the gain will reduce overall depth but by doing so you can also improve your ...

Page 12: ...eave the target 1 1 2 to 2 feet is adequate for a small shallow target wider for deeper larger tar gets This is DIFFERENT from most other metal detectors you may be accustomed to which use a conventional discriminator to attempt to identify iron The main thing is not to hover or dawdle over a target while analyzing As with the locked forward position the squeezed position also functions while in M...

Page 13: ... THRESHOLD hum levels you will hear the faintest of target signals while cancelling out environmental background noise and improve concentration Threshold Adjustment The GMT has an improved microprocessor driven THRESHOLD control that is adjusted with a single turn It does not therefore require a 10 turn pot for precise adjustment Digital software provides much higher resolution thus you can set t...

Page 14: ...in In MANUAL mode the GRAB PAD can give you a head start on using the plus and minus pads for your initial GROUND BALANCE calibration While searching in MANUAL mode pressing and releasing the GRAB PAD updates the manual ground balance setting instantaneously you may fine tune with the touch pad Ground Balance Fast Auto Trac Gold is usually found in mineralized ground To make it easier to track out...

Page 15: ...is reference number will be higher or lower depending on the mineralization of the ground below Higher numbers for negative ground usually rich in black sand and magnetite and lower numbers for positive ground usually in the form of maghemite or alka line soil Once ground balance is achieved in the Manual mode the number value will remain the same It will only change if the pads are adjusted To ma...

Page 16: ...the hole but in your pile of dirt Techniques for exam ining the pile of dirt are discussed later in the manual page 20 Again the procedure is to sweep over the target from side to side noting the side to side center Then turn 90 degrees and sweep the coil side to side noting the center from this new direction X marks the spot that you need to dig You can prac tice with a small pieces of lead or go...

Page 17: ...hones make sure they have a VOLUME CONTROL as there is no target vol ume control on the GMT This is an important comfort and safety issue Remember that you want the faintest THRESHOLD hum possible but a strong comfortable target signal With headphones you will be able to work with a lower THRESH OLD hum hear fainter target signals avoid bothering others with a beeping box and save on battery life ...

Page 18: ...not IRON You want to detect lead brass copper aluminum and silver Any of these metals can simulate the Field Use Tuning Tips sound of a gold nugget and must be dug Keep a particular lookout for the tiny lead bird shot so common in mining areas If you are detecting these tiny targets you are doing everything right and will eventually find gold Manual GROUND BALANCE tuning for very small nuggets fla...

Page 19: ...nd press the button The fact is whenever the sound decreases as the coil ap proaches the ground it will actually increase as the coil is lifted away from the ground and vice versa Sometimes it is easier to hear an increase in sound rather than a decrease in sound If this is easier for you merely correct with the pad if the sound increases when the coil is lifted and correct with the pad when the s...

Page 20: ...onal one the fast AUTOTRAC soft ware will realize the negative hot rocks are a bigger problem than the matrix itself and will track near the hot rock balance point quieting them down a lot You may be forced to dial in more VSAT speed and or reduce ground penetrating GAIN to keep a workable THRESHOLD hum Positive Hot Rocks and Alkalai They are usually red or various shades of red to almost black Th...

Page 21: ...ognize a true target possible nugget from pieces of mineral commonly referred to as hot rocks It is not wise to keep a high level of GAIN if the detector will not operate smoothly This is a false sense of security Recognizing a true target is the most important part of detecting This is an example of when less GAIN will produce more nuggets You must be the best judge of just how much noise you can...

Page 22: ...and you stop the coil over it the overload squawk and message will continue When you raise the search Chapter 5 GMT Searching mineralizatiion High Gain and slower SAT will not get you the Gold in heavy mineralization as well as lower GAIN and a bit of faster SAT Overload The GMT can most always tell the difference between overload from a large metal target and extreme mineralization or hot rock Un...

Page 23: ...t These improvements kick in progressively at settings higher than 6 allowing better ground silencing in highly variable ground At these higher settings negatilve hot rocks will sound different giving a double blip sound or vanishing entirely rather than giving the boing sound you will get at lower settings Another difference between a gold nugget and a negtative hot rock is that when you sweep ba...

Page 24: ...tanding up from a dig C Do not use any lubricants such as WD 40 on any part of your detector D Do not modify your instrument during its warranty period I Cleaning A Both the coiland rod are waterproof and can be cleaned with fresh water and mild soap The control box is not water proof and must be kept dry Never lift a wet coil above the height of the control box as water can run down the inside of...

Page 25: ...t on quality products backed by quality service Our Factory Authorized Service Centers are factory trained and equipped They offer the same quality service as the factory Service before and after the sale is the cornerstone of our customer relations White s Authorized USA Service Centers Centerville Electronics 13810 B Braddock Road Centerville Virginia 20121 Toll Free 1 888 645 0202 Fax 1 703 222...

Page 26: ... Card is filled out and returned to the factory address by your dealer soon after original purchase for the purpose of recording this information and keeping you up to date regarding White s ongoing research development The warranty does not cover damage caused by accident misuse neglect alterations modifications unauthorized service or prolonged exposure to corrosive compounds including salt Dura...

Page 27: ..._______________________________________________________ ________________________________________________________________ Instrument Serial Number __________________________________________ Original Purchase Date _____________________________________________ New Owner Name __________________________________________________________ Address ________________________________________________________ ___...

Page 28: ... Number __________________________ inside of battery compartment Purchase Date __________________________ The date on the sales receipt Dealer Name _____________________________________________________________________ Address ___________________________________________________________________ Telephone ________________________________________________________________ Payment method ________________...

Page 29: ...redict the probability of a target being iron and thus reduce the amount of iron trash being dug This exclusive Iron I D system is presented to the user both visually on the meter at all times and audibly when desired White s Iron I D Probability System does not alter the depth detection of the GMT The GMT also retains the Variable SAT feature so popular with gold prospectors By adjusting the spee...

Page 30: ...nc 1011 Pleasant Valley Road Sweet Home OR 97386 USA Distribution 1 800 547 6911 Factory 1 541 367 6121 FAX 1 541 367 2968 Web Site http www whiteselectronics com White s Electronics Inc P N 621 0428 Printed in USA Rev 8 2001 ...

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